参数资料
| 型号： | DS2781E+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/31页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE BATT 8TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 燃料，电量检测计/监控器 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 2.5 V ~ 10 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-TSSOP |
| 包装： | 带卷 (TR) |
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DS2781
Figure 2. Typical Operating Circuit
PACK+
DS2781
500
1K
DATA
150
DQ
PIO
OVD
VDD
VIN
VB
1 or 2
Cell
Li-Ion
Stack
SNS
VSS
PACK-
Protection
5.6V
TSSOP-8
RSNS
0.1uF
0.1uF
Circuit
POWER MODES
The DS2781 has two power modes: ACTIVE and SLEEP. On initial power up, the DS2781 defaults to ACTIVE
mode. While in ACTIVE mode, the DS2781 is fully functional with measurements and capacity estimation
continuously updated.
In SLEEP mode, the DS2781 conserves power by disabling measurement and capacity estimation functions, but
preserves register contents. SLEEP mode is entered under two different conditions. An enable bit makes entry into
SLEEP optional for each condition. The first condition in which SLEEP is entered is a bus low condition. The Power
Mode (PMOD) bit must be set to enter SLEEP when a bus low condition occurs. (PMOD = 1 AND BUS_LOW). A
bus low condition, where the DQ pin is low for t SLEEP (2s nominal), is used to detect a pack disconnection or system
shutdown in which the bus pull-up voltage, V PULLUP , is not present. PMOD type SLEEP assumes that no charge or
discharge current will flow and therefore coulomb counting is not necessary. A system with PMOD SLEEP enabled
must ensure that a stand-alone or cradle charger includes a pull-up on DQ. The DS2781 transitions from PMOD
SLEEP to ACTIVE mode when DQ is pulled high, as would happen when a battery is inserted into a system.
The second condition to enter SLEEP is an under voltage condition (measured on V IN ). When the Under Voltage
Enable (UVEN) bit is set, the DS2781 will transition to SLEEP if the VIN voltage is less than V SLEEP (Selectable 2.45
or 4.9V). The bus must be in a static state, that is with DQ either high or low for t SLEEP . UVEN SLEEP reduces
battery drain due to the DS2781 to prevent over discharge. The DS2781 transitions from UVEN SLEEP to ACTIVE
mode when DQ changes logic state. The bus master should initiate communication when charging of a depleted
battery begins to ensure that the DS2781 enters ACTIVE mode from UVEN SLEEP.
NOTE: PMOD and UVEN SLEEP features must be disabled when a battery is charged on an external charger that
does not connect to the DQ pin. PMOD SLEEP can be used if the charger pulls DQ high. UVEN SLEEP can be
used if the charger toggles DQ. The DS2781 remains in SLEEP and therefore does not measure or accumulate
current when a battery is charged on a charger that failures properly drive DQ.
INITIATING COMMUNICATION IN SLEEP
When beginning communication with a DS2781 in PMOD SLEEP, DQ must be pulled up first and then a 1-Wire
Reset pulse must be issued by the master. In UVEN SLEEP, the procedure depends on the state of DQ when
UVEN SLEEP was entered. If DQ was low, DQ must be pulled up and then a 1-Wire Reset pulse must be issued
by the master as with PMOD SLEEP. If DQ was high when UVEN SLEEP was entered, then the DS2781 is
prepared to receive a 1-Wire reset from the master. In the first two cases with DQ low during SLEEP, the DS2781
does not respond to the first rising edge of DQ with a presence pulse.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2781EVKIT+ | 制造商:Maxim Integrated Products 功能描述:1-CELL OR 2-CELL STAND-ALONE FUEL GAUGE IC - Boxed Product (Development Kits) |
| DS2781G+ | 功能描述:电池管理 1-2 Cell Stand-Alone Fuel Gauge RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| DS2781G+T&R | 制造商:Maxim Integrated Products 功能描述:2 CELL STAND ALONE FG 10-TDFN LF - Tape and Reel |
| DS2781G-A2+T&R | 制造商:Maxim Integrated Products 功能描述: |
| DS2781K | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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